Peng, JB Yu, BY Pyun, CH Kim, CH Jin, JI 2024-01-21T19:31:32Z 2024-01-21T19:31:32Z 2021-09-05 1996-08 0021-4922 https://pubs.kist.re.kr/handle/201004/144374 A new polymer of polyester derivative (PE) blend with poly(N-vinycarbazole) (PVK) and compound of PBD at various weight ratio were used as emitter in unilayer electroluminescence (EL) devices with indium cathode. Analyses of fluorescence and EL spectra imply common emission energy states are formed in the blend films, by which to explain the possibility of maximum EL efficiency in blend films higher than that in either of PE and PVK. The PL and EL spectra show the maximum emission band shifts red slightly between 430 nm and 450 nm as increasing the ratio of PE, meanwhile the half width increases and a new peak around 525 nm appears. The new peak is confirmed originating from the dimer formed by coupling of interchains in polymer PE. Both of PE and PVK can give rise to PL emission under UV light. The origin of PC and EL emission is analysed. English JAPAN J APPLIED PHYSICS LIGHT-EMITTING-DIODES POLYMER BLENDS EMISSION COPOLYMERS Blue electroluminescence mechanism of polyester derivative blend films Article 10.1143/JJAP.35.4379 1 JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, v.35, no.8, pp.4379 - 4382 JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS 35 8 4379 4382 scie scopus A1996VF45000038 2-s2.0-0030206578 Physics, Applied Physics Article LIGHT-EMITTING-DIODES POLYMER BLENDS EMISSION COPOLYMERS blue electroluminescence photoluminescence blend films polyester unilayer structure